/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef UV_WIN_REQ_INL_H_
#define UV_WIN_REQ_INL_H_

#include <assert.h>

#include "uv.h"
#include "internal.h"

#define SET_REQ_STATUS(req, status) \
    (req)->u.io.overlapped.Internal = (ULONG_PTR)(status)

#define SET_REQ_ERROR(req, error) \
    SET_REQ_STATUS((req), NTSTATUS_FROM_WIN32((error)))

#define SET_REQ_SUCCESS(req) \
    SET_REQ_STATUS((req), STATUS_SUCCESS)

#define GET_REQ_STATUS(req) \
    ((NTSTATUS)(req)->u.io.overlapped.Internal)

#define REQ_SUCCESS(req) \
    (NT_SUCCESS(GET_REQ_STATUS((req))))

#define GET_REQ_ERROR(req) \
    (pRtlNtStatusToDosError(GET_REQ_STATUS((req))))

#define GET_REQ_SOCK_ERROR(req) \
    (uv_ntstatus_to_winsock_error(GET_REQ_STATUS((req))))

#define REGISTER_HANDLE_REQ(loop, handle, req)   \
    do {                                         \
        INCREASE_ACTIVE_COUNT((loop), (handle)); \
        uv__req_register((loop), (req));         \
    } while (0)

#define UNREGISTER_HANDLE_REQ(loop, handle, req) \
    do {                                         \
        DECREASE_ACTIVE_COUNT((loop), (handle)); \
        uv__req_unregister((loop), (req));       \
    } while (0)

#define UV_SUCCEEDED_WITHOUT_IOCP(result) \
    ((result) && (handle->flags & UV_HANDLE_SYNC_BYPASS_IOCP))

#define UV_SUCCEEDED_WITH_IOCP(result) \
    ((result) || (GetLastError() == ERROR_IO_PENDING))

#define POST_COMPLETION_FOR_REQ(loop, req)                            \
    if (!PostQueuedCompletionStatus((loop)->iocp,                     \
            0,                                                        \
            0,                                                        \
            &((req)->u.io.overlapped))) {                             \
        uv_fatal_error(GetLastError(), "PostQueuedCompletionStatus"); \
    }

INLINE static void uv_req_init(uv_loop_t* loop, uv_req_t* req)
{
    req->type = UV_UNKNOWN_REQ;
    SET_REQ_SUCCESS(req);
}

INLINE static uv_req_t* uv_overlapped_to_req(OVERLAPPED* overlapped)
{
    return CONTAINING_RECORD(overlapped, uv_req_t, u.io.overlapped);
}

INLINE static void uv_insert_pending_req(uv_loop_t* loop, uv_req_t* req)
{
    req->next_req = NULL;
    if (loop->pending_reqs_tail) {
#ifdef _DEBUG
        /* Ensure the request is not already in the queue, or the queue
     * will get corrupted.
     */
        uv_req_t* current = loop->pending_reqs_tail;
        do {
            assert(req != current);
            current = current->next_req;
        } while (current != loop->pending_reqs_tail);
#endif

        req->next_req = loop->pending_reqs_tail->next_req;
        loop->pending_reqs_tail->next_req = req;
        loop->pending_reqs_tail = req;
    } else {
        req->next_req = req;
        loop->pending_reqs_tail = req;
    }
}

#define DELEGATE_STREAM_REQ(loop, req, method, handle_at) \
    do {                                                  \
        switch (((uv_handle_t*)(req)->handle_at)->type) { \
        case UV_TCP:                                      \
            uv_process_tcp_##method##_req(loop,           \
                (uv_tcp_t*)((req)->handle_at),            \
                req);                                     \
            break;                                        \
                                                          \
        case UV_NAMED_PIPE:                               \
            uv_process_pipe_##method##_req(loop,          \
                (uv_pipe_t*)((req)->handle_at),           \
                req);                                     \
            break;                                        \
        default:                                          \
            assert(0);                                    \
        }                                                 \
    } while (0)
//zero
/*																				\
case UV_TTY:                                                            \
uv_process_tty_##method##_req(loop,                                   \
(uv_tty_t*) ((req)->handle_at),         \
req);                                   \
break;                                                                \
\
*/

INLINE static int uv_process_reqs(uv_loop_t* loop)
{
    uv_req_t* req;
    uv_req_t* first;
    uv_req_t* next;

    if (loop->pending_reqs_tail == NULL)
        return 0;

    first = loop->pending_reqs_tail->next_req;
    next = first;
    loop->pending_reqs_tail = NULL;

    while (next != NULL) {
        req = next;
        next = req->next_req != first ? req->next_req : NULL;

        switch (req->type) {
        case UV_READ:
            DELEGATE_STREAM_REQ(loop, req, read, data);
            break;

        case UV_WRITE:
            DELEGATE_STREAM_REQ(loop, (uv_write_t*)req, write, handle);
            break;

        case UV_ACCEPT:
            DELEGATE_STREAM_REQ(loop, req, accept, data);
            break;

        case UV_CONNECT:
            DELEGATE_STREAM_REQ(loop, (uv_connect_t*)req, connect, handle);
            break;

        case UV_SHUTDOWN:
            /* Tcp shutdown requests don't come here. */
            assert(((uv_shutdown_t*)req)->handle->type == UV_NAMED_PIPE);
            uv_process_pipe_shutdown_req(
                loop,
                (uv_pipe_t*)((uv_shutdown_t*)req)->handle,
                (uv_shutdown_t*)req);
            break;

        case UV_UDP_RECV:
            uv_process_udp_recv_req(loop, (uv_udp_t*)req->data, req);
            break;

        case UV_UDP_SEND:
            uv_process_udp_send_req(loop,
                ((uv_udp_send_t*)req)->handle,
                (uv_udp_send_t*)req);
            break;

        case UV_WAKEUP:
            uv_process_async_wakeup_req(loop, (uv_async_t*)req->data, req);
            break;

        case UV_SIGNAL_REQ:
            uv_process_signal_req(loop, (uv_signal_t*)req->data, req);
            break;

        case UV_POLL_REQ:
            uv_process_poll_req(loop, (uv_poll_t*)req->data, req);
            break;

        case UV_PROCESS_EXIT:
            uv_process_proc_exit(loop, (uv_process_t*)req->data);
            break;

        case UV_FS_EVENT_REQ:
            uv_process_fs_event_req(loop, req, (uv_fs_event_t*)req->data);
            break;

        default:
            assert(0);
        }
    }

    return 1;
}

#endif /* UV_WIN_REQ_INL_H_ */
